Design and demonstration of 1Gbit/s optical wireless interface for mobile phones

A 1 Gbit/s optical wireless interface for a mobile phone is designed and in particular, the conditions of the diameter of the photodiode and NA of the condenser lens are cleared. A prototype of the instantaneous file transfer system with the interface, which can be attached to a mobile phone, is then fabricated based on the design. The receive-area diameter of 14.3 mm and the receive angle of 31 degrees are experimentally obtained at a transmission distance of 50 mm. 100 MB file transfer between the interfaces attached to the mobile phones is successfully carried out at a transmission distance of 50 mm without a single bit error and in less than I second.